Revelation 4:6, 9
Revelation 4:6 NASB1995
and before the throne there was something like a sea of glass, like crystal; and in the center and around the throne, four living creatures full of eyes in front and behind.
Revelation 4:9 NASB1995
And when the living creatures give glory and honor and thanks to Him who sits on the throne, to Him who lives forever and ever